Brake



BRAKE Filed NOV. 14, 1929 2 sheets-sheet 1 v INVENTOR'.

Vincent u pple BY 1 ATTORNEYS July 31, 1934.

v. G. APPLE 68,590

BRAKE Filed Nov. 14, 1929' 2 Sheets-Sheet 2 INVENTOR.

Vincent dqpple A TTORNE YS Patented July 31, 1934 nxaxs Vincent G. pple.Dayton. O i m Bendix Brake Company, South Bend, Ind a corporation ofIllinois My invention relates to improvements in brakes and hasparticular reference to the type commonly used on automotive vehicles. I

An object of my invention is .to provide a simply constructed andefliciently operating power brake assembly for use on the front orsteerable wheel of an automotive vehicle, much the same as thatdescribed in my Patent No. 1,876,541 and Teissue thereof, Serial No.686,139, wherein the construction is broadly disclosed and claimed andto utilize therewith an electromagnet or solenoid as a power source.

Another object of my invention is to include in such a front wheelsolenoid power brake assembly an operatingmember'so connected to thebrake shoe actuating mechanism that the latter may be manually operatedby the vehicle driver, either in dependently of or in conjunction withthe Further objects will be apparent from the following descriptiontaken in conjunction with the accompanying drawings wherein likenumerals refer to like parts throughout .the several figures, andwherein Fig. 1 is a transverse section taken on the line 1--1 of Fig. 2and Fig. 2 is a vertical line 2-.-2 of Fig. 1.

In the drawings the steering knuckle comprises the usual spindle 2having radially extending arms 4 and 6 which carry the hubs 8'and 10 forthe bushings 12 and 14. The steering pivotorkingpin16istight1ysecuredinthehub18o! axle 20 and rotatable inthefibushings 12 and 14. The anti-friction thrust bearing 22 under thehub 18 takes the vertical steering load. On the outer end of the spindle2 is keyed a hub member-24 and on the inner end is rotatably iournalledthe sleeve member 26 by means 0! the roller bearings28and30,whichbearingsarelocatedaxially on the spindle by means of thespacer member 32.

Abrakednnn33isriveted,asat 34,tothe flange 36 oI-the wheel hub 38 andthis combination is bolted together with the wheel proper by means ofthe nuts 40 and the bolts 42. The coverplate44isboltedasat46totheopeninnerendot the'brake drum and is provided with a centralaperture which is rivetedto the flange 48 or the There-is anotherbearing axial section taken on the atitsinnerend. I

'metorqueplate52isrivetedto aradlallyex solenoid, from a point outsidethe enclosed brake Application November 14, 1929, Serial No. 407,082

. 7 china. (cl. 188-156) tending flange 54 on the hub member 24" andcarries the studs 56 and 58 which serve as anchors for adjacent ends ofthe radially expansible friction shoes 60 and 62. The otheradjaoent'ends of the two friction shoes are connected by means of'theright and left screw adjustment mechanism 64. The brake operating lever66 is tulcrumed between the two anchored ends of the brake shoes 60 and62 by means of a third stud .68 which is carried by the torque plate,and carries the conventional camming mechanism broadly indicated at 70pivoted thereto at 72 for the purpose of expanding the shoes 60 and 62into engagement with the inner periphery of the drum 33.

Depending from the hub member 24 is the flange 74 to which is bolted thesolenoid '16 which constitutes the power means for actuating the ,brakearm 66 to operatethe brakes. This solenoid is of the same general typedescribed by me in detail in my copending application Serial No.404,236, filed November 2, 1929 except for the fact that the plunger, orarmature coil, "18 operates in the opposite direction. This solenoidconsists of .a fieldeore which is made up of a plurality of laminae 82held together by the bolts 84 and the cap screws 86, which secure thefield tothe depending flange 74.-.The field laminae 82 are-ofrectangular outer and inner contourand thus compose a continuousrectangular frame except for thefact that it is cut away at 8'! to admitthe armature core 78fwhich is illustrated in Fig. 2 in the'positionwhich it reaches when it has applied the brakes to their full onposition.

The two ends of the solenoid coil. are connected to a conductor cablewhich extends transversely through thespindle 2, therefrom at a pointoutside the drum enclosure where it is connectedtoasolmceoteurrentsupply, not shown herebecauseitiormsnopartofthepr'esentinvention.However, a control which includes means for varyinsthecurrentsuppliedtothecoil is preferable. Y

'lhebitm'catedlowerendliliotthe brakeoperatinglever66straddles aspacingstudeoon one end of the armature core '18 to'form an op-' eratlveconnection between the two. Thus the movement of the armature core '16,when the solenoid 76isenergized,actuatesthelever66toapply the brakesthrough the action of th'e'cam mech'anismwhichl have indicated broadlyat '10.

.ThemeanswhichIhave lncorporatedinthis.

brake assembly for operating'the brakes mannally'tromapointmtsidethedrumenclosureis controlledbythesleeve26,whichextends1rom 2 within to apoint outside the drmniand is pro-' vided on its inner end with gearteeth 92 and on its outer end with a radially extending arm94.

A sector lever 96 is pivoted to the boss 98 which is formed on thetorque plate 52 and is provided with gear teeth 100 which mesh with theteeth on the sleeve 26. The sector lever has an arm 102 to which ispivoted a linlg 104 and this link is connected to the brake operatinglever 66 through an elongated slot 106 which engages the stud 108 on thesaid operating lever. Thus a slip Joint between the sector lever 96 andthe brake operating lever 66 is provided whereby the said lever may beactuated to apply the brake shoes either independently of or inconjunction with the solenoid 76.

The arm 94 may be connected up to the brake operating pedal by means ofany desirable mechanicallinkage, and the sleeve thus rotated to applythe brakes manually.

Having illustrated and described a single embodiment of my inventionvarious modifications will be apparent to those skilled in the art, andI therefore intend to limit myself only within the scope of the appendedclaims.

, I claim:

1. Brake mechanism comprising a non-rotatable swivelled wheel spindlehaving a hub keyed thereto and a sleeve rotatably iournalled thereon, arotatable closed brake drum having bearing surfaces on the spindle andsleeve, brake shoe actuating mechanism and a solenoid supported withinsaid drum by the hub, a lever operatively connecting said actuatingmechanism with the solenoid plunger, and a lost motion connectionbetween said sleeve and said lever whereby rotation of the former willoperate the lever independently of the solenoid. s

2. Brake mechanism comprising a swivelled wheel spindle secured againstrotation, a closed drum rotatably journalled thereon, radiallyexpansible friction means and a solenoid secured against rotation withinthe drum, camming' means for expanding the friction means likewisesecured within the drum, a lever operatively connecting the solenoidwith the camming means, a

part rotatable within said drum from a point outside, and a lost motionconnection between said lever and said part whereby rotation ofthe'latter will actuate said leverindependently of the solenoid. I

3. Brake mechanism comprising a swivelled wheel spindle secured /againstrotation by one end, a hub secured against rotation thereon, a

of the solenoid. Y

. roeacoo sleeve having an arm at each end thereof rotatable about saidspindle adjacent said hub, brake shoes and asolenoid supported by thehub, a cam arm for actuating the brake shoes operatively connected tothe solenoid, a closed drum rotatably journalled on the spindle and saidsleeve intermediate its arms, and a lost motion connection between saidsleeve and cam arm whereby rotation of the former actuates the latterindependently of the solenoid.

4. Brake mechanism comprising a non-rotatable swivelled wheel spindle, aclosed brake drum rotatably journalled thereabout, brakeshces and asolenoid secured against rotation within the drum, a camming armoperable by the solenoid to actuate the brake shoes, and means operablefrom outside the drum having a lost motion connection with said cammingarm whereby the brakes may be manually actuated independently 5; Brakemechanism comprising, in combination, a rotatable, bralre drum,bralre'mecha arranged therein to be urged thereagainst, a solenoidcoupled with the brake'mechanism to actuate the same, a swingablysupported gear section coupled with the brake mechanism to actuatethesame and a manually rotatable part engaging said gear sectionto'swing the same.

6. Brake mechanism comprising in combination a non-rotatable axle, aclosed drum rotat- 5 ably joumalled therein, expansible friction meansand a' solenoid for expanding the same secured against rotation withinthe drum, a sleeve rotatable about said axle, operative connectionswithin the drum between said friction means and said sleeve, including agear sector, and means operable from a point outside the drum forrotating said sleeve whereby the friction means may be expandedindependently of the solenoid.-

7. Brake mechanism comprising in combination a non-rotatable axle, aclosed drum rotatablyjournalled thereon,expansible friction means i anda lever for expanding the, same suppomd against rotation within thedrum, a'solenoid sup=- ported within the drum connected with said lever,a sleeve rotatable about said axle, from a point outside the drum andprovided with gear teeth at its inner extremity, a gear sector pivotedwithin the and meshing with said gear teeth, and a lost motionconnectionbetween said gear sector and lever whereby the friction meansy be expanded independently of the solenoid.

vm o.

